On the evening of the 30th of August General von Kluck received wireless messages from the headquarters of the Second Army reporting a decisive victory, and asking the First Army to wheel inwards towards the line La Fere-Laon in order to gain the full advantages of the victory. General von Kluck replied that the First Army had wheeled round towards the Oise and would advance on the 31st by Compiegne and Noyon to exploit the success of the Second Army. This was the much-discussed wheeling movement, or swerve, which was discovered by the British from the air. Von Kluck had been ordered by the German Supreme Command on the 28th to continue his march towards the Lower Seine. Now, in response to von Buelow's request, he wheeled his army south-eastwards towards the Oise. The German Supreme Command was informed of this, and replied, 'The movement begun by the First Army is in accordance with the wishes of the Supreme Command'. The Royal Flying Corps reports of the 31st of August gave to the British Command the first intimation of what was happening. Here is one of them: _Date_: 31.8.1914. _Pilot_: Lieutenant A. E. Borton. _Observer_: Captain E. W. Furse. _Hour at which reconnaissance commenced_: 9.20 a.m. _Time._ _Place._ _Observation._ 9.55 Villeneuve. Motor T. 9.58 E. Roberval. " 10.2 At Station N. of Motor T. halted clear of road. Verberie. 10.6 La Croix. Cavalry and transport much opened out, head La Croix. 10.13 Compiegne. Clear. 10:20 Chevincourt. Cavalry about 1 Bde. moving towards Thourotte. Head near that place. More cavalry and guns following across fields. Bivouac at Chevincourt. Transport coming in from Marest road 10.25. 10.26 Mareuil. Cavalry column still continues--opened out--new column trotting S. 10.27 Lassigny. Artillery just S. of town moving south. Column ended just S. of Lassigny (1/2 mile). Another column, tail Lassigny, was moving towards Thiescourt. Also mounted troops. About one mile N. of Lassigny mounted troops in bivouac and on road from Roye, stretching right up to Roye. Columns included guns and motor transport. Parked transport just N. of Roye.